Add validChanged(bool) to PathChooser.

This is useful when e.g. connecting directly to the setEnabled() slot of
a Widget.

src/libs/utils/basevalidatinglineedit.cpp

@@ -138,10 +138,12 @@ void BaseValidatingLineEdit::slotChanged(const QString &t)
         m_bd->m_state = newState;
         m_bd->m_firstChange = false;
         setTextColor(this, newState == Invalid ? m_bd->m_errorTextColor : m_bd->m_okTextColor);
-        if (validHasChanged)
+        if (validHasChanged) {
+            emit validChanged(newState == Valid);
             emit validChanged();
         }
     }
+}
 
 void BaseValidatingLineEdit::slotReturnPressed()
 {

src/libs/utils/basevalidatinglineedit.h

@@ -81,6 +81,7 @@ public:
 
 signals:
     void validChanged();
+    void validChanged(bool validState);
     void validReturnPressed();
 
 protected:

src/libs/utils/pathchooser.cpp

@@ -108,6 +108,7 @@ PathChooser::PathChooser(QWidget *parent) :
     connect(m_d->m_lineEdit, SIGNAL(validReturnPressed()), this, SIGNAL(returnPressed()));
     connect(m_d->m_lineEdit, SIGNAL(textChanged(QString)), this, SIGNAL(changed(QString)));
     connect(m_d->m_lineEdit, SIGNAL(validChanged()), this, SIGNAL(validChanged()));
+    connect(m_d->m_lineEdit, SIGNAL(validChanged(bool)), this, SIGNAL(validChanged(bool)));
     connect(m_d->m_lineEdit, SIGNAL(editingFinished()), this, SIGNAL(editingFinished()));
 
     m_d->m_lineEdit->setMinimumWidth(200);

src/libs/utils/pathchooser.h

@@ -99,6 +99,7 @@ private:
 
 signals:
     void validChanged();
+    void validChanged(bool validState);
     void changed(const QString &text);
     void editingFinished();
     void beforeBrowsing();